Trimming device for overseaming and other sewing-machines.



No. 802,587. PATENTED OCT. 24, 1905. L. DNDERDONK. TRIMMING DEVICE FOR OVERSEAMING AND OTHER SEWING MACHINES.

APPLICATION FILED PEB.18.1902

5 SHEETS-SHEET 1.

No. 802,587. PATENTED OCT. 24, 1905. L. ONDEBDONK. TRIMMING DEVICE FOR OVERSEAMING AND OTHER SEWING MACHINES.

APPLIUATION FILED IBB. 18,1902.

Wicwmao 55. WW%/ No. 802,587 1 PATENTED OUT. 24, 1905. L. ONDERDONK. TRIMMING DEVICE FOR OVERSEAMING AND OTHER SEWING MACHINES.

APPLICATION FILED FEB.18,1902.

5 SHEETSSHEET 3.

"mus" iLTC II PATENTED OCTJZ L, 1905.

L. ONDERDONK. TRIMMING DEVICE FOR OVERSEAMING AND OTHER SEWING MACHINES.

APPLIGATION FILED FEB. 18. 1902.

5 SHEETS-SHEET 4.

V 7/44/16.) fw/uaf No. 802,587. PATENTED OCT. 24, 1905. L, ONDERDONK. TRIMMING DEVICE FOR OVERSEAMING AND OTHER SEWING MAGHINES.

APPLICATION FILED PEB.1B,1902.

5 SHEBTSSHEBT 5.

WITNESSES f /NVE 70 @i6/ flaw Web;

' t -I', dwwgi m A TTOHNEY ANDREW a GRAHAM m, mowumyomwzns, vusumarou, D (L LANSING ONDERDONK, OF NEW YORK, N. Y., ASSIGNOR TO THE UNION SPECIAL SEWING MACHINE COMPANY, OF CHICAGO, ILLINOIS. A COR- PORATION OF ILLINOIS.

TRIMMING DEVICE FOR OVERSEAMING AND OTHER SEWING-MACHINES.

I No. 802,587.

Specification of Letters Patent.

Patented Oct. 24, 1905.

Application filed February 18, 1902. Serial No. 94,590.

To all whom it may concern.-

Be it known that I, LANSING ONDERDONK, a citizen of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Trimming Devices for Overseaming and other Sewing Machines, of which the following is a description, reference being had to the accompanying drawings and to the letters and figures of reference marked thereon.

The present invention relates to an improvement in trimming devices for sewingmachines, the especial obj cct of the invention being to provide a trimming device for use in connection with machines for overseaming or finishing the edges of knit goods, the trimmer acting in advance of the stitchforming mechanism to prepare the edge for the reception of the binding-stitches.

As herein shown, my improved trimmer is applied to a machine such as illustrated in my application for Letters Patent filed June 4, 1901, Serial No. 63,078; but it will be understood that I do not wish to be limited to its application to that machine alone, but is applicable to other types of sewing-machines.

The invention consists in the matters hereinafter described, and referred to in the appended claims.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a front elevation, partly in section, of a sewing-machine embodying my invention. Fig. 2 is a rear elevation of the same. Fig. 3 is a top plan view, partly in section, with the bed-plate removed, of a sewing-machine embodying the invention. Fig. 4 is a perspective view of the trimmersupporting bar in its relation to the other parts of the sewing-machine mechanism. Fig. 5 is a perspective view of the cloth-plate and throat-plate, showing also the guide for deflecting the trimmed-off strip, the stationary blade cooperating with the movable blade, and the opening for the passage of the lint. Fig. '6 is a detail view, partly in section, showing the mechanism for operating the trimmer. Fig. 7 is a similar view showing the trimmer thrown out of action. Fig. 8 represents detached parts of the mechanism for throwing the trimmer into and out of action.

In the drawings, A represents the bed of a sewing-machine embodying my invention; B, the gooseneck; C, the needle-lever; D, the needle-bar; E, the belt-wheel; F, the eccentrio connecting-rod; C, the needle-lever extension; G, the driving-shaft; a, the looper, and X the spreader or looping-hook operated from the needle-lever extension C and carrying a loop of needle-thread from beneath the work-plate out into position to be engaged by the looper.

As above stated, the present invention appertains particularly to the trimming mechanism, in which 9 represents the upper or movable trimmer-blade, which cooperates with the stationary blade 10, preferably adjustably secured to the bed-plate beneath the throat-plate or with a portion of it extending above the cloth-plate to guide the upper blade in its descent. This lower blade 10 is, as above stated, secured to the bedplate below the throat-plate 11, which latter is of the shape shown in Fig. 5, having a de pressed portion 12, a body portion 7, an opening 8 for the passage of the looper from below up over the edge of the fabric, and the usual openings for the feed-dog and a tongue 14, over which the stitches are formed.

The cloth-plate slide 17 is provided with an adjustable guide 15 to deflect the trimmedofl' strip away from the needle and an opening 16, through which the lint is carried off.

Below the throat-plate and attached to the bed-plate is a plate 5, having a downwardly-turned corner 6.

The upper blade 9 of the trimmer is adj ustably secured by the screw 18 to the curved arm 19, which at its lower end below the bed-plate of the machine has a sleeve 20, clamped to a rock-shaft 21, journaled in bearing-lugs 22. Slight play is given the rock shaft 21, and an adjustable screwthreaded sleeve 23, arranged on the end thereof and having a head 24 bearing against the colied spring 25 around the shaft, regulates the tension of the spring, which spring keeps the knife when in operative position in bearing-contact with the lower stationary knife, the two blades cooperating to produce the trimming action, and by manipulating the adjustable sleeve 23 wear of the upper blade may be taken up. Projecting from the sleeve 20 is a boss or projection 26, to

The screws 31, which hold the flat pieces to the blocks, serve also the purpose of tak ing up the wear on the fork-piece embracing the eccentric. As the main shaft rotates the fork-piece will vibrate up or down loosely on the rock-shaft 21.

In order to oscillate the rock-shaft and through it the trimmer-blade 9, I provide a mechanism to throw the rock shaft into rigid engagement with the fork-piece, as shown in Figs. 6, 7, and 8. This mechanism comprises an arm 32, fixedly clamped on the rockshaft 21 between the sleeve and formed at its outer end, as at 33, to be clamped and held in position by the latch 34, pivoted to the forked piece, preferably normally drawn inwardly by the spring 35. A thumb-piece 36 on the latch enables the op erator to throw the latch out of engagement with the arm 32, allowing the latter through the spring 27 to be drawn out of engagement with the oscillating fork, thus allowing the latter to oscillate freely on the rockshaft 2].. It will be noticed that when the upper trimmer-blade-supporting member is forced down into cooperative relation to the lower stationary blade 10 the arm 32 will also be forced down, and the end 33 of said arm is so formed that it will force the latch to one side, and then the spring will draw it so that its upper end 37 will clamp the arm 32 and hold the fork-piece and arm 32 rigidly together, and in the oscillation of the fork-piece the upper trimmer-blade will also oscillate.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

l. The herein-described trimming device for sewing-machines, comprising an upper trimmer blade supporting member, and means for oscillating the same comprising a driving shaft, a vibrating arm operated thereby, a second arm connected to and movable with the trimmer blade supporting member, and a pivoted hooked catch carried by one of said arms and adapted when the upper trimmer-blade is moved into operative position with respect to the lower trimmerblade to automatically engage and lock the said second arm and vibrating arm rigidly together; substantially as described.

2. The hereindescribed trimming device for sewing-machines, comprising an upper trimmer blade supporting member, and means for oscillating the same comprising a driving shaft, a vibrating arm operated thereby, a second arm connected to and movable with the trimmer blade supporting member, and a pivoted hooked catch carried by one of said arms and adapted when the upper trimmer-blade is moved into operative position with respect to the lower trimmer-blade to automatically engage and lock the said second arm and vibrating arm rigidly together, and means for raising the upper trimmer-blade out of operative engagement with the lower bladewhen the catch is released; substantially as described.

3. A sewingmachine trimming device, comprising a rock-shaft, a trimmer-knifesupporting arm secured thereto, two arms extending forwardly from said rock-shaft, one fixed thereon and one pivoted thereto, connections between the pivoted arm and the driving-shaft of the machine, and a pivoted spring catch normally engaging the fixed arm and holding it in locked connection with the loose arm, and means for throwing the fixed arm and trimmer-knife out of operation when the catch is released; substantially as described.

4. A trimming device for sewing-machines comprising a rockshaft to which the knifesupporting arm is fixed, a member pivotally attached to said rock-shaft, and operatively connected with the driving-shaft, a second member fixed to said rock-shaft, and a catch pivoted to the pivoted member and nor mally engaging the fixed member, whereby said members are normally interlocked, and a spring for raising the knife-supporting arm when the catch is released; substantially as described.

5. A trimming device for sewing-machines, comprising a rock-shaft, a knife-supporting arm fixed thereto, a forked arm loosely pivoted upon said rock-shaft, with connections between the same and the driving-shaft, a second arm fixed to the rock-shaft and springheld out of engagement with the pivoted arm and a catch for holding the fixed arm against the pressure of the spring in engagement with the pivoted arm; substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

LANSING ONDERDONK.

WVitnesses W. H. MoYER, M. VAN WAGNER. 

